Abstract
Deformation styles of the Cretaceous-Tertiary Shimanto belt of southwest Japan have been examined in the eastern Kyushu and Kanto mountains. An early ductile deformation, which affects only the basal part of the Cretaceous formations, predates a widespread south-verging brittle deformation. The ductile deformation, which occurred between Lower Cretaceous and Lowermost Eocene time, is characterized by two conspicuous microstructures: a cleavage ( S1) and a stretching lineation ( L1). The L1 trend is transverse to the belt, averaging north-south. Strain analysis reveals a non-coaxial deformation regime related to synmetamorphic shearing directed from south to north. Such a landward vergence is thought to reflect back-thrusting at the rear of a Cretaceous accretionary prism formed along the SW margin of Japan.
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